Shenlida's bucking unit catalogue contains five product configurations. This guide compares the published Shenlida products; it is not a universal classification of every bucking unit on the market.

Continuous 360° bucking unit

The continuous-rotation model family uses hydraulic main and back-up tongs and describes automatic torque control and recording. Its parameter tables cover multiple SLD models. For example, SLD 10-136 lists a 60–254 mm size range and maximum torque of 136 kN·m; SLD24-260 lists 60–615 mm and 260 kN·m. These are separate model ratings, not interchangeable limits.

YNJ hydraulic bucking unit

The YNJ160/15 and YNJ200/15 use synchronised main and back-up clamping. The published size ranges are 1 9/16–6 in and 2 3/8–7 11/16 in respectively. Both list rated low-gear torque of 15,000 N·m and high-gear torque of 2,600 N·m. Automatic torque control is optional.

Bottom-opening bucking unit

The bottom-opening configuration is described for pipe and rod thread connections in workover operations. The page describes its downward-opening clamp arrangement and optional torque control, recording and curves. Confirm numerical capacity with Shenlida because the page does not publish a capacity table.

SLD8026 make-up and break-out unit

The SLD8026 is described for assembling and maintaining threaded drilling and downhole tools. Its published maximum make-up torque is 150,000 ft·lbs and maximum break-out torque is 190,000 ft·lbs. Headstock and tailstock diameter ranges differ, so check the complete clamp and die configuration.

Skid-mounted bucking unit

The skid-mounted product page provides equipment imagery but no published numerical ratings. Send the proposed workpiece size, torque requirements and installation layout to obtain a confirmed configuration.

Choose by the workpiece and required configuration

Compare both diameter and torque, then review clamping, tool support, control and installation requirements. Use the selection checklist and the linked product specifications before requesting a quotation.